Okay, let's say you have:
- A password that consists of a single unknown character repeated an unknown number of times.
- A strong password hashing algorithm that doesn't impose an upper limit on length.
How hard is your incredibly unwise passphrase for a cracker to guess?
First, you have to know which character it is. If we go with printable ASCII characters, that gives us 94 possibilities.
However, if we stretch the alphabet out to include all UTF-8 codepoints, you get 1,112,064 possible values.